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A B B ME A SUR EMENT & A N A LY TIC S | COMMISSIONING INSTRUC TION

AWT420

Universal 4-wire, dual-input transmitter

Measurement made easy

Introduction

The AWT420 is a universal 4-wire, dual-input 
transmitter suitable for the measurement and 
control of a wide range of parameters including pH, 
ORP, conductivity, turbidity/suspended solids and 
dissolved oxygen.

The AWT420 supports both traditional analog and 
advanced digital EZLink sensors. 

This Commissioning Instruction provides 
installation, operation and maintenance procedures 
for the AWT420 transmitter. For information on the 
sensors, including installation, commissioning, 
operation and maintenance procedures, refer to the 
specific sensor manual.

For more information

Further publications for the AWT420 transmitter  
are available for free download from: 

www.abb.com/measurement

 

or by scanning this code:

Links and reference numbers for the transmitter 

publications are also shown below:

Search for/click on:

AWT420 transmitter – Data Sheet

DS/AWT420-EN

AWT420 transmitter – 

 

Operating Instruction

O

I/AWT420-EN

AWT420 transmitter – 

 

HART Communications Supplement

COM/AWT420/

 

HART-EN

AWT420 transmitter – 

 

HART FDS Communications Supplement

COM/AWT420/

 

HART/FDS-EN

AWT420 transmitter – 

 

PROFIBUS Communications Supplement

COM/AWT420/

PROFIBUS-EN

AWT420 transmitter – 

 

MODBUS Communications Supplement

COM/AWT420/

MODBUS-EN

AWT420 transmitter – 

 

Ethernet Communications Supplement

COM/AWT420/

ETHERNET-EN

AWT420  
Universal 4-wire, 
 dual-input transmitter

Summary of Contents for AWT420

Page 1: ...nance procedures refer to the specific sensor manual For more information Further publications for the AWT420 transmitter are available for free download from www abb com measurement or by scanning th...

Page 2: ...trode sensors 12 pH and conductivity connections 13 pH ORP pIon sensor module connections 13 Power supply connection 14 Fitting the EZLink modules 16 Connecting EZLink sensors 18 Long cables 18 6 Easy...

Page 3: ...nk PCB upgrade spares kit 37 Communications module assemblies 37 AWT420 HART PCB upgrade spares kit 37 AWT420 Profibus PCB upgrade spares kit 37 AWT420 Modbus PCB upgrade spares kit 37 AWT420 Ethernet...

Page 4: ...ury To ensure safe use when operating this equipment the following points must be observed Up to 240 V AC may be present Be sure to isolate the supply before removing the terminal cover Safety advice...

Page 5: ...ed down if it has been installed to IP66 NEMA 4X standards i e cable glands are correctly fitted and all unused cable entry holes are blanked off see page 11 and page 10 Warm water and a mild detergen...

Page 6: ...igure 1 AWT420 transmitter main components 4 Mechanical installation Transmitter installation Optional accessories Optional installation accessories Cable gland kit Weathershield Panel mount kit Pipe...

Page 7: ...CE If the optional weathershield D is used position it between the transmitter and wall and pass 2 screws C through fixing holes both sides in weathershield Referring to Figure 5 1 Position the left a...

Page 8: ...The correct torque is critical to ensure proper compression of the panel seal and achieve the IP66 NEMA 4X hosedown rating 4 Holding assembly F together position bracket D into the left hand recess on...

Page 9: ...e holes to suit vertical or horizontal pipe secure the clamp plate to the pipe mounting bracket B using two M6 x 8 mm hexagon head screws and spring lock washers C 3 Position the pipe mounting bracket...

Page 10: ...Profibus and Ethernet communication wiring ONLY A special cable gland is supplied with the Ethernet communications option and should be used only for the Ethernet cable The use of cable glands cable...

Page 11: ...s module PCB slot Communication module connections refer to separate supplements HART COM AWT420 HART EN MODBUS COM AWT420 MODBUS EN PROFIBUS COM AWT420 PROFIBUS EN ETHERNET COM AWT420 ETHERNET EN AC...

Page 12: ...Red Black Brown Green Yellow Blue 2085 2 lead Red Blue Yellow Dark green TB2 2 lead Green Black Blue Yellow Dark green AC2xx 2 lead Green Black Blue Red Yellow Dark green 3 lead Green Black Yellow Red...

Page 13: ...d Clear Black Red White TB5 2 lead Blue Black Red White AP1xx 2 lead Clear Black Red Red White 3 lead Clear Black White Red Red AP3xx 2 lead Blue Black Red White 3 lead Blue Black Red White Grey APS1x...

Page 14: ...ly 1 cable per cable gland Referring to Figure 11 page 15 1 Using a suitable screwdriver release door retaining screw A and open the transmitter door 2 Release terminal cover retaining screw B and rem...

Page 15: ...420 EN REV B 15 Figure 11 Connecting the transmitter AC mains power supply A D E F G H 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 GLASS GUARD REFERENCE SOLUTION EA R TH PT PT SCREEN PT 3 rd COMMUNICATIONS Sensor...

Page 16: ...onnector for sensor 1 passes through cable entry D b if two EZLink modules are used push fit sensor 1 module into location C and sensor 2 module into location E Note When fitting the cable assemblies...

Page 17: ...nnector body using the flats on the alignment washer see Figure 13 9 Screw back nut J onto connector body and tighten using a spanner Figure 14 Securing the EZLink connector cable assembly Referring t...

Page 18: ...Setup prompt is displayed Press the key to start Easy Setup or press the key to cancel and exit to the main Operator page Press the key Edit to change the default value setting to the required value s...

Page 19: ...items and decrease displayed values E Group key Toggles between Operator pages 1 to 5 when an Operator page is selected with the View key View screens Diagnostics View Signals View Alarms View and Out...

Page 20: ...g CAL shortcut D Press the key C below the CAL prompt Figure 19 Operator menus Operator menus comprise Operator Pages displays the Operator page for each available sensor Data Views displays enabled d...

Page 21: ...H and turbidity The highest priority diagnostic or alarm is displayed Other active diagnostic alarm states can be viewed on the Diagnostics View see page 22 Figure 20 Operator Page multiple sensors 4...

Page 22: ...fer to the sensor s Operating Instruction the bargraph flashes to indicate the value is outside the specified range When multiple sensors are fitted and Autoscroll is selected from the Operator Menu s...

Page 23: ...View 01 O2 O3 O4 CAL 04 09 2019 08 10 11 Diagnostics View PV Failure NV Error Cal Failed Cleaning NAMUR icon and message priority see page 64 Diagnostic message View icon No Message CAL 04 09 2019 08...

Page 24: ...shown in Table 3 The Diagnostics Log shows the history of diagnostic messages that have been displayed in the Diagnostic View see page 26 Log entry Description Cal Failed Calibration procedure failed...

Page 25: ...toring Do not expose to static electricity electrical noise or magnetic fields When handling an SD card take care not to touch any exposed metal contacts Back up critical data stored on removable medi...

Page 26: ...29 Access level screen Level Access Logout Displayed only after Calibrate or Advanced levels are accessed Logs the user out of the current level If passwords are set a password must be entered to acce...

Page 27: ...A Range High View the span value used in Chart and Bargraph views N A Range Low View the zero value used in Chart and Bargraph views N A Filter Type Select the signal filtering type None Low Medium Hi...

Page 28: ...gs Note The temperature compensation characteristic TC Curve for signal A should be set to NaCl Note The temperature compensation characteristic TC Curve for signal B should be set to NH3 Difference C...

Page 29: ...string 6 characters maximum for the custom user defined concentration units N A Conc Curve Table Set the user defined concentration curve using the 6 point linearizer table concentration against condu...

Page 30: ...surement Manual Automatic Note If Temperature Sensor type Manual the temperature value is not displayed in the associated Operator page or Signals View N A Low Slope Limit A pH probe degrades over tim...

Page 31: ...4 mbar 380 to 835 mm Hg If the barometric pressure is unknown leave at the default sea level value of 1013 mbar 760 mm Hg 1013 mbar Reset To Defaults Select to reset all Sensor Setup parameters to the...

Page 32: ...it hubs or EZLink connectors Security Password protection Access to configuration levels is enabled only after the user has entered a password Calibrate level user assigned password Advanced level use...

Page 33: ...4 to 158 F Altitude 2000 m 6562 ft max above sea level Audit log and Alarm log data are stored in the same log file 2 electrode conductivity Conductivity input Measurement range and resolution Cell c...

Page 34: ...eference temperature 25 C 77 F Configured output range Sensor group Min span Max span A 100 S cm 2000 mS cm B 10 S cm 2000 S cm pH ORP Redox pH ORP Redox input Sensor types pH Glass Antimony Sb ORP Re...

Page 35: ...s with Part 15 of the FCC Rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference recieved including...

Page 36: ...cause interference and This device must accept any interference including interference that may cause undesired operation of the device Le pr sent appareil est conforme aux CNR d Industrie Canada app...

Page 37: ...spares kit Part number 3KXA877420L0011 EZLink module assemblies AWT420 EZLink PCB upgrade spares kit Part number 3KXA877420L0015 Communications module assemblies AWT420 HART PCB upgrade spares kit Pa...

Page 38: ...A877210L0103 Weathershield and pipe mount kit Part number 3KXA877210L0104 Gland packs EZLink connectors Gland packs Part number 3KXA877420L0111 3KXA877420L0112 3KXA877420L0113 3KXA877420L0114 3KXA8774...

Page 39: ...oid is a trademark of Google LLC Bluetooth is a registered trademark of Bluetooth SIG Inc HART is a registered trademark of the FieldComm Group iOS is a trademark of Apple Inc registered in the U S an...

Page 40: ...this document and in the subject matter and illustrations contained therein Any reproduction disclosure to third parties or utilization of its contents in whole or in parts is forbidden without prior...

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